Hoe to tell which version

[thugdevotion]

Hey BG (or charlie) I'm still a little mixed up right now. Even though you told me if I have a electrical warning at the bottom of my PS2 it's a v4(which it does), I searched around the forum and in some post it said if the PS2 has 10 screws it's a v3 and mine has 10 screws. So given the infomation again could you tell me which version I have?

SCPH:30001
BAR CODE: PT11
SERIAL CODE: U16
DATE CODE: 1A
SCREWS: 10
ELEC WARNING: YES

Thanks for your help.